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Finding the Fourth Proportional to 691,612.32, 954,663.12 and 405,225.12

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Solution

The fourth proportional to 691,612.32, 954,663.12 and 405,225.12 is: 559,350.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,612.32 : 954,663.12 = 405,225.12 : x
  2. Step 2: Convert to fraction form
    691,612.32/954,663.12 = 405,225.12/x
  3. Step 3: Cross multiply
    691,612.32x = 954,663.12 × 405,225.12
  4. Step 4: Simplify right side
    691,612.32x = 386,853,477,361.57
  5. Step 5: Solve for x
    x = 386,853,477,361.57/691,612.32
  6. Step 6: Final answer
    x = 559,350.18

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.